Accession Number:

AD0646519

Title:

EFFECT OF SURFACE-LAYER QUALITY ON THE USEFUL LIFE OF ROLLER BEARINGS,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1966-09-28

Pagination or Media Count:

15.0

Abstract:

The report presents the results of an investigation of the possibilities of increasing the useful life of roller bearings by improving the surface-layer quality of the operating surfaces of the rollers and of the bearing races. Conclusions are 1 Grinding cannot be regarded as a final operation in finishing of the operating surfaces of bearings, since the microdefects resulting from the grinding operation lower the efficiency of the surface layers. 2 In the final lapping operations it is necessary to remove the defective layer of 0.15-0.02 mm obtained as the result of the preliminary grinding operation. 3 In dull polishing of rollers and manual polishing of the bearing races a surface layer of low quality is obtained. There is a considerable improvement in the quality of the surface-layer finish and a 30-40-percent increase in useful life after lapping operations bright polishing of the rollers and superfinishing of the bearing races. 4 In preliminary grinding of the rollers and races it is necessary to introduce machine truing of the grinding wheels and to perform this operation regularly after having removed a specified amount of the bearing part. 5 An increase in surface-finish quality of the operating surfaces to class 10 will permit the plant to increase the useful life of bearings by 30. 6 The existing technological process does not ensure the required precision in contact between the roller and the bearing race only a band with a width of 2-4mm is involved in the operation of the bearing. Author

Subject Categories:

  • Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE